Rest Receiver Channel - HTTP 401 Unauthorized error

[Bhargavakrishna]

Dear All,

We are working on a REST to REST synchronous scenario. The target endpoint is working fine and we are able to test and post the data from postman, but when I'm testing the interface from SAP PO, the messages are getting failed with HTTP - 401 unauthorized error. We are on SAP PO 7.5 SP19.

Error Details

The messages are getting failed with the below error.

MP: exception caught with cause com.sap.aii.adapter.rest.ejb.common.exception.HttpCallException: HTTP POST call to https://test:443:xxx not successful. Unauthorized

Server returned code: 401

Please note that we are using basic authentication in both postman and the channel.

Actions performed so far.

1) Verified the credentials and end point.

2) Performed dummy changes in the channels and activated

3) Created new REST receiver channel

4) Enabled the trace in the target application, but the nothing got logged.

5) Performed cache refresh.

6) verified the content type and message headers.

7) verified the payloads from postman and from Po, both are same.

😎 Target application certificates were deployed already under trusted ca's with validity.

9) HTTP Destination ping test returned with HTTP status code 500 from NWA.

Please note that in the password, we are using "-", not sure, if is this causing any issue?

Request you to help me to fix this issue.

Thanks in advance.

Regards

Bhargava Krishna Talasila

[pavan04kumar]

Bhargava,

Do you have any firewall in your landscape which is blocking?

As you are using https connection did you exchange the certificates between pi and target system?

Try posting the same message from postman as well as from pi.

Regards,

Pavan

[amontella96]

Hi bhargavakrishna.talasila

did you do any connectivity tests from PO? Try to create a destination in PO NWA and test it ...

Let us know,ty!A

[Bhargavakrishna]

Hi Amon,

Yes we already have http destination to this application in NWA and tested it.

It gave http - 500 status when did the ping destination test. This should be fine as we sent empty request.

Regards

Bhargava Krishna Talasila

[Bhargavakrishna]

Hi Pavan,

Both SAP PO and the target applications are within the firewall.

Target application is SAP ECC and the certificates are already in place under trusted ca's with validity till end of this year.

Yes, i have taken the payload from sap PO and compared with the postman payload both are same.

Regards

Bhargava Krishna Talasila

[amontella96]

hi bhargavakrishna.talasila

It maybe you have ciphers SSL issues, can you install xpi-inspector and check whats the outcome?

Also you stated you have concerns about - character in the password, y don't you try changing that to something easy for the matter of test? cheers!A

[manoj_khavatkopp]

Hi Bhargav ,

Add below module parameter , restart channel and try :

useAuthPreemptive = true

[JayChan]

Hi, useAuthPreemptive = true Approach works for my case
Actually, instead of HTTP 401, my case return HTTP 500 where error msg said "HTTP POST call to https://xxxxxxxx not successful. Unauthorized"